STMicroelectronics STEVAL-ILL043V1

Overview

STEVAL-ILL043V1 from STMicroelectronics is a demonstration board implementing a 100W transition-mode (TM) PFC pre-regulator using the L6562A controller, designed for IEC61000-3-2 Class D compliance in flat-panel TV and monitor power supplies. It delivers 400V DC output at 100W with <5% THD across 90–264V AC input, features SO-8-packaged L6562A IC, integrated gate driver capable of ±800mA peak sink/source, and supports auxiliary-winding-free ZCD sensing via R-C network.

For engineers reviewing the STEVAL-ILL043V1 datasheet, STEVAL-ILL043V1 application, STEVAL-ILL043V1 bill of materials, or STEVAL-ILL043V1 design reference, this page provides verified layout implementation details, measured THD performance data, component selection rationale for RZCD/CZCD (330kΩ/22pF), OVP resistor divider design (R1=1MΩ), and thermal behavior under 100W continuous load - all validated per ST's EVL6562A-TM-80W schematic and application note AN3177.

Technical Context

The board implements fixed-off-time TM control using the L6562A's proprietary multiplier architecture to minimize crossover distortion, with ZCD pin synchronized directly from the MOSFET drain via 330kΩ/22pF network - eliminating need for auxiliary winding. The error amplifier uses a 2.5V internal reference (±1% @25°C) and 1MΩ/9.43kΩ resistor divider to regulate 400V output while enabling dynamic OVP at +40V overvoltage.

THD optimization is achieved by injecting a voltage-dependent offset into the multiplier output near line zero-crossings, reducing conduction dead-angle without compromising PF. Gate drive operates with active pull-down during UVLO and clamps GD output at 12V to protect MOSFET gate, supporting STP8NM50FP (500V, 8A) with 175ns delay-to-output and 200ns leading-edge blanking on CS pin.

Key Specifications

Availability

STEVAL-ILL043V1 is available at Aetrix Electronics and suitable for flat-panel TV power supply development, monitor SMPS qualification, and IEC61000-3-2 Class D compliance validation requiring stable component supply and reference design traceability.

Supply support for STEVAL-ILL043V1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in power management, analog, microcontrollers, and automotive ICs with ISO 9001-certified manufacturing.

This board belongs to ST's STEVAL evaluation platform family, engineered to accelerate time-to-compliance for EN61000-3-2 PFC designs targeting consumer display and computing power supplies up to 400W.

FAQ

Can STEVAL-ILL043V1 be used for 400W applications?

No. The board is rated for 100W continuous operation using STP8NM50FP and optimized magnetics. While the L6562A IC supports up to 400W, scaling requires larger MOSFET, upgraded boost inductor, enhanced heatsinking, and revised current-sense resistor - none of which are implemented on this demo board per ST's AN3177 validation scope.

Does STEVAL-ILL043V1 include EMI filtering components?

Yes. It integrates X-capacitors (C1 = 0.22µF/630V), common-mode choke (T1), and NTC thermistor (2.5Ω) for inrush limiting - all selected to meet conducted EMI requirements per CISPR-22 Class B when combined with proper enclosure grounding and PCB layout per ST's layout guidelines in UM1573.

What is the purpose of R11 (1MΩ) on the board?

R11 sets the dynamic overvoltage protection threshold at +40V above nominal 400V output, based on L6562A's 27µA OVP trigger current and Equation 3 (∆VO = R1 × 20µA). Its 1% tolerance ensures OVP accuracy within ±1.2%, critical for capacitor derating and system safety margin.

Is the L6562A on this board the DIP-8 or SO-8 variant?

The STEVAL-ILL043V1 uses the SO-8 packaged L6562AD variant, as confirmed by ST's official BOM in UM1573 Rev 3 and visible footprint on the board layout - matching the SO-8 pinout shown in Figure 2 of the L6562A datasheet and enabling compact surface-mount assembly.